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(x^3)/3-(25*x) = 0
(x^3)/3-25*x = 0
1/3*x^3-25*x = 0
x*(1/3*x^2-25) = 0
1/3*x^2 = 25 // : 1/3
x^2 = 75
x^2 = 75 // ^ 1/2
abs(x) = 5*3^(1/2)
x = 5*3^(1/2) or x = -(5*3^(1/2))
x = 0
x = 0
x in { 5*3^(1/2), -(5*3^(1/2)), 0 }
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